package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.item.dto.CategoryDTO;
import com.leyou.item.entity.Category;
import com.leyou.item.entity.CategoryBrand;
import com.leyou.item.mapper.CategoryMapper;
import com.leyou.item.service.CategoryBrandService;
import com.leyou.item.service.CategoryService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.stream.Collectors;

/**
 * @author 虎哥
 */
@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private CategoryBrandService categoryBrandService;

    @Override
    public List<CategoryDTO> queryCategoryByBrandId(Long brandId) {
        // 查询中间表 SELECT * FROM tb_category_brand WHERE brand_id = 18374
        List<CategoryBrand> categoryBrandList = categoryBrandService.query()
                .eq("brand_id", brandId).list();
        // 从CategoryBrand获取分类id
        /*List<Long> ids = new ArrayList<>(categoryBrandList.size());
        for (CategoryBrand categoryBrand : categoryBrandList) {
            ids.add(categoryBrand.getCategoryId());
        }*/
        List<Long> idList = categoryBrandList.stream()
                .map(CategoryBrand::getCategoryId).collect(Collectors.toList());
        // 查询分类表
        List<Category> list = listByIds(idList);
        // 转换DTO
        return CategoryDTO.convertEntityList(list);
    }
}